Speedo no worky

[CToney]

The '92 I have had no speedo sensor so I stole one off of my '93 parts truck. I test drove the truck and the speedo doesn't work. I could swap the odometer off of my other truck but I want to check other stuff out first. Should there be power on the one wire that comes to the sensor? I have a tach in the truck so a speedo is not a necessity but it would be nice.



On my test drive I was pleased with the performance. The injectors and turbo that I took off my other truck worked good. I just have to get it safetied then the muffler can be MIA. Or an expansion chamber can be installed to muffle it a bit.

 

[TWorline]

If I remember correctly the speedo sensor pulses the ground. It could also be that the little plastic gear in the speedo head fell apart, that is what happened to mine.

 

[GIT-R-DONE]

I had to run an extra ground wire to mine to get it to work, but that was after replacing the unit on the trans, which was broken. There is also a fix for the speedo plastic gears behind the speedometer, incase they are stripped out. Try the other gauge first and see what happens.

 

[Rattler]

When my son pulled the trans in his 92, he pulled too hard on the wire connector for the speedo. He drove this way a couple of months before i made him stop and fix it. You could put a multi-meter on the two wires and tell they were okay, but he had pulled one of the leads back just enough that it wasn't making good contact on the plug. Just one more thing to check,Randy

 

[CToney]

To check the plastic gears I would have to remove the actual piece from my transfer case? Nothing would surprise me on this truck anymore. I even had to change the sensor for low vacuum for the brakes. I believe that there is no system or part of this truck that hasn't been modified, for good and bad, or farmified in some way.



Thanks for the help.

 

[TWorline]

The plastic gears I referred to was in the speedometer head itself. If you have an extra sitting around I would slap it in and see if it works. Changing the gear in the back of the speedometer only takes about half an hour, but you have to be so carefull it seems to take for ever! I just knew those little plastic pieces was going to disinagrate in my hands!